As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FWD WEB AREA STA 300 LBL 11 INTERCOSTAL HAS CORROSION ON UPPER SURFACE. GROUNDED - YES. REMOVED CORROSION ON INTERCOSTAL. ORIG THICKNESS IS .071",REMOVED .016"WITH 0.055' REMAININGFOUND OUT OF LIMITS IAW B737-800 SRM 53-10-51-1A-1.REMOVED AND REPLACED INTERCOSTAL IAW B737-800 SRM 51-40-02 AND BOEING DWG # 141A5600 REV A DWG 141A5400 REV -, AND DWG 251A2204 REV -.